We believe in a quality product that's why we install vaillant boilers,with up to ten year warranty,we have central heating engineers in stockport ready to help you get the best products for you, and also a smart control of your choosing its advisable and best pratice to install a system filter to prevent sludge in the system and boiler thats why we use the magna clean professional 2 as our filter of choice as we feel it does the best job of filtering the debris out of the system and by adding the correct corrosion inhibitors these steps are essential to prevent problems down the line.Contact us for further info on choosing the correct model for your needs